Now that the voting is closed, first of all thank you for the high participation and lets have a look at the results, which seem to show a quite unequivocal preference:
Loudspeaker A Votes: 7 13.5%
Loudspeaker B Votes: 42 80.8%
Loudspeaker C Votes: 0 0.0%
Loudspeaker D Votes: 7 13.5%
So, as promised, lets get to the next phase, where you can write about what you heard (it would be great if you would incluse with which transducer you heard the samples), the differences, your preference and your guesses which loudspeaker brands, models or types these could be.